| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact bookbinding hard cover capable of simply adhering a back cardboard sheet and a cover cardboard sheet to the compact bookbinding hard cover and being beautifully finished. SOLUTION: The compact bookbinding hard cover 1 adheres a release sheet (tack sheet) by coating an adhesive material layer to an inside surface, and exposes the material layer when the release sheet is released. A part Pa surrounded in a rectangular shape by abcd is the release sheet of a part for adhering the cover cardboard sheet of the front side, A part Pb surrounded in a rectangular shape by abst is a back cardboard sheet and the release sheet of the part for adhering the cover cardboard of a rear side, and Pc, Pd, Pe, Pf and Pg are the release sheets. The front side cover cardboard, the back cardboard sheet and the rear side cover cardboard are adhered, and cut at its left end side at a predetermined position. The release sheets of Pc, Pd, Pe, Pf and Pg are released, their portions of the cardboard are bent to the inside, and the compact bookbinding hard cover is finished.
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